private RuntimeResult VisitWhileNode(WhileNode node, Context context)
{
RuntimeResult condResult = Visit(node.Condition, context);
if (condResult.HasError)
{
return(condResult);
}
Values.Value output = new Values.NullValue().SetPositionAndContext(node.Position, context);
while (condResult.Value.GetAsBoolean())
{
RuntimeResult bodyResult = Visit(node.Body, context);
if (bodyResult.HasError)
{
return(bodyResult);
}
if (context.Return)
{
return(bodyResult);
}
output = bodyResult.Value;
if (context.Break)
{
context.Break = false;
break;
}
condResult = Visit(node.Condition, context);
if (condResult.HasError)
{
return(condResult);
}
}
return(new RuntimeResult(output));
}
private RuntimeResult VisitForEachNode(ForEachNode node, Context context)
{
RuntimeResult iterResult = Visit(node.Iteratable, context);
if (iterResult.HasError)
{
return(iterResult);
}
int elementCount = iterResult.Value.GetElementCount();
string varName = node.Token.Value.ToString();
for (int i = 0; i < elementCount; i++)
{
RuntimeResult runtimeResult = iterResult.Value.GetElementAt(i);
if (runtimeResult.HasError)
{
return(runtimeResult);
}
context.AddSymbol(varName, runtimeResult.Value);
RuntimeResult bodyResult = Visit(node.Body, context);
if (bodyResult.HasError)
{
return(bodyResult);
}
}
return(new RuntimeResult(iterResult.Value));
}
private static void Execute(string code, string fname, Context context, bool inlineOutput)
{
Tokenizer tokenizer = new Tokenizer(fname, code);
TokenizerResult tokenizerResult = tokenizer.GenerateTokens();
if (!tokenizerResult.HasError)
{
Parser parser = new Parser(tokenizerResult.Tokens);
ParserResult parserResult = parser.Parse();
if (!parserResult.HasError)
{
Interpreter interpreter = new Interpreter();
RuntimeResult runtimeResult = interpreter.Visit(parserResult.Node, context);
if (!runtimeResult.HasError)
{
if (inlineOutput)
{
Console.WriteLine(runtimeResult.Value);
}
}
else
{
Console.WriteLine(runtimeResult.Error);
}
}
else
{
Console.WriteLine(parserResult.Error);
}
}
else
{
Console.WriteLine(tokenizerResult.Error);
}
}
private RuntimeResult VisitVarAssignNode(VarAssignNode node, Context context, Context baseCtx = null)
{
string name = node.Token.Value.ToString();
if (name == "null" || name == "true" || name == "false" || name == "this" || name == "base")
{
return(new RuntimeResult(new RuntimeError(node.Token.Position, "'" + name + "' is a reserved keyword", context)));
}
RuntimeResult runtimeResult = Visit(node.Node, baseCtx != null ? baseCtx : context);
if (runtimeResult.HasError)
{
return(runtimeResult);
}
if (node.TypeToken == null)
{
if (context.ContainsSymbol(name) && context.GetSymbol(name).TypeDefined)
{
Values.ValueType toType = context.GetSymbol(name).Type;
if (toType != runtimeResult.Value.Type)
{
Values.Value castedValue = runtimeResult.Value.Cast(toType);
if (castedValue == null)
{
return(new RuntimeResult(new RuntimeError(node.Token.Position, "Can't convert '" + runtimeResult.Value.Type.ToString().ToLower() + "' to '" + toType.ToString().ToLower() + "'", context)));
}
else
{
context.AddSymbol(name, castedValue);
return(runtimeResult);
}
}
}
context.AddSymbol(name, runtimeResult.Value);
return(runtimeResult);
}
else
{
if (node.TypeToken.CheckKeyword("int"))
{
return(TypeDefAssign(Values.ValueType.INTEGER, runtimeResult.Value, name, node.Token.Position, context));
}
if (node.TypeToken.CheckKeyword("complex"))
{
return(TypeDefAssign(Values.ValueType.COMPLEX, runtimeResult.Value, name, node.Token.Position, context));
}
if (node.TypeToken.CheckKeyword("long"))
{
return(TypeDefAssign(Values.ValueType.INT64, runtimeResult.Value, name, node.Token.Position, context));
}
if (node.TypeToken.CheckKeyword("big"))
{
return(TypeDefAssign(Values.ValueType.BIGINTEGER, runtimeResult.Value, name, node.Token.Position, context));
}
}
return(new RuntimeResult(new RuntimeError(node.Token.Position, "Type conversion error", context)));
}
private RuntimeResult VisitListNode(ListNode node, Context context)
{
List <Values.Value> elements = new List <Values.Value>();
for (int i = 0; i < node.ElementNodes.Count; i++)
{
RuntimeResult runtimeResult = Visit(node.ElementNodes[i], context);
if (runtimeResult.HasError)
{
return(runtimeResult);
}
elements.Add(runtimeResult.Value);
}
return(new RuntimeResult(new Values.ListValue(elements).SetPositionAndContext(node.Position, context)));
}
private RuntimeResult VisitSubscriptNode(SubscriptNode node, Context context)
{
RuntimeResult baseResult = Visit(node.BaseNode, context);
if (baseResult.HasError)
{
return(baseResult);
}
RuntimeResult indexResult = Visit(node.IndexNode, context);
if (indexResult.HasError)
{
return(indexResult);
}
return(baseResult.Value.Subscript(indexResult.Value));
}
private RuntimeResult VisitReturnNode(ReturnNode node, Context context)
{
if (node.Node == null)
{
Values.Value val = new Values.NullValue().SetPositionAndContext(node.Position, context);
context.Return = true;
return(new RuntimeResult(val));
}
else
{
RuntimeResult result = Visit(node.Node, context);
if (result.HasError)
{
return(result);
}
context.Return = true;
return(new RuntimeResult(result.Value));
}
}
private RuntimeResult VisitDictionaryNode(DictionaryNode node, Context context)
{
List <(Values.Value, Values.Value)> pairs = new List <(Values.Value, Values.Value)>();
for (int i = 0; i < node.KeyValuePairs.Count; i++)
{
RuntimeResult keyResult = Visit(node.KeyValuePairs[i].Item1, context);
if (keyResult.HasError)
{
return(keyResult);
}
RuntimeResult valueResult = Visit(node.KeyValuePairs[i].Item2, context);
if (valueResult.HasError)
{
return(valueResult);
}
pairs.Add((keyResult.Value, valueResult.Value));
}
return(new RuntimeResult(new Values.DictionaryValue(pairs).SetPositionAndContext(node.Position, context)));
}
private RuntimeResult VisitIfNode(IfNode node, Context context)
{
for (int i = 0; i < node.Cases.Count; i++)
{
RuntimeResult condResult = Visit(node.Cases[i].Item1, context);
if (condResult.HasError)
{
return(condResult);
}
if (condResult.Value.GetAsBoolean())
{
return(Visit(node.Cases[i].Item2, context));
}
}
if (node.ElseCase != null)
{
return(Visit(node.ElseCase, context));
}
return(new RuntimeResult(new Values.NullValue().SetPositionAndContext(node.Position, context)));
}
private RuntimeResult VisitUnaryNode(UnaryNode node, Context context)
{
RuntimeResult runtimeResult = Visit(node.Node, context);
if (runtimeResult.HasError)
{
return(runtimeResult);
}
if (node.Token.Type == TokenType.MINUS)
{
return(runtimeResult.Value.Multiply(new Values.IntegerValue(-1).SetPositionAndContext(node.Token.Position, context)));
}
else if (node.Token.Type == TokenType.BOOLEAN_NOT)
{
return(runtimeResult.Value.BooleanNot());
}
else if (node.Token.Type == TokenType.COMPLEMENT)
{
return(runtimeResult.Value.BitwiseComplement());
}
return(null); // todo: error handling
}
private RuntimeResult VisitWhenNode(WhenNode node, Context context)
{
Values.Value variable = context.GetSymbol(node.Token.Value.ToString());
if (variable == null)
{
return(new RuntimeResult(new RuntimeError(node.Token.Position, "Variable '" + node.Token.Value + "' not defined", context)));
}
for (int i = 0; i < node.Cases.Count; i++)
{
RuntimeResult condResult = Visit(node.Cases[i].Item1, context);
if (condResult.HasError)
{
return(condResult);
}
if (condResult.Value.Equals(variable).Value.GetAsBoolean())
{
return(Visit(node.Cases[i].Item2, context));
}
}
//if (node.ElseCase != null)
// return Visit(node.ElseCase, context);
return(new RuntimeResult(new Values.NullValue().SetPositionAndContext(node.Token.Position, context)));
}
private RuntimeResult VisitSubscriptAssignNode(SubscriptAssignNode node, Context context)
{
SubscriptNode subscript = (SubscriptNode)node.Target;
RuntimeResult targetResult = Visit(subscript.BaseNode, context);
if (targetResult.HasError)
{
return(targetResult);
}
RuntimeResult indexResult = Visit(subscript.IndexNode, context);
if (indexResult.HasError)
{
return(indexResult);
}
RuntimeResult exprResult = Visit(node.Node, context);
if (exprResult.HasError)
{
return(exprResult);
}
return(targetResult.Value.SubscriptAssign(indexResult.Value, exprResult.Value));
}
private RuntimeResult VisitDoNode(DoNode node, Context context)
{
Values.Value output = new Values.NullValue().SetPositionAndContext(node.Position, context);
while (true)
{
RuntimeResult bodyResult = Visit(node.Body, context);
if (bodyResult.HasError)
{
return(bodyResult);
}
output = bodyResult.Value;
RuntimeResult condResult = Visit(node.Condition, context);
if (condResult.HasError)
{
return(condResult);
}
if (!condResult.Value.GetAsBoolean())
{
break;
}
}
return(new RuntimeResult(output));
}
private RuntimeResult VisitBlockNode(BlockNode node, Context context)
{
Values.Value output = new Values.NullValue().SetPositionAndContext(node.Position, context);
for (int i = 0; i < node.Statements.Count; i++)
{
RuntimeResult runtimeResult = Visit(node.Statements[i], context);
if (runtimeResult.HasError)
{
return(runtimeResult);
}
if (context.Return)
{
return(runtimeResult);
}
if (context.Continue)
{
context.Continue = false;
return(runtimeResult);
}
output = runtimeResult.Value;
}
return(new RuntimeResult(output));
}
private RuntimeResult VisitAttributeNode(AttributeNode node, Context context)
{
RuntimeResult runtimeResult = Visit(node.BaseNode, context);
if (runtimeResult.HasError)
{
return(runtimeResult);
}
if (node.Node.Type == NodeType.VAR_ASSIGN)
{
return(VisitVarAssignNode((VarAssignNode)node.Node, runtimeResult.Value.Context, context));
}
else if (node.Node.Type == NodeType.CALL)
{
if (runtimeResult.Value.Type == Values.ValueType.ASSEMBLY)
{
CallNode callNode = (CallNode)node.Node;
Values.AssemblyValue asmVal = (Values.AssemblyValue)runtimeResult.Value;
string name = ((VarAccessNode)callNode.Node).Token.Value.ToString();
List <object> args = new List <object>();
for (int i = 0; i < callNode.Arguments.Count; i++)
{
RuntimeResult result = Visit(callNode.Arguments[i].Item2, context);
if (result.HasError)
{
return(result);
}
if (result.Value.Type == Values.ValueType.LIST)
{
object[] array = Util.ListToArray(result.Value);
if (array == null)
{
return(new RuntimeResult(new RuntimeError(callNode.Position, "Error while converting list to an array", context)));
}
args.Add(array);
}
else if (result.Value.Type == Values.ValueType.BYTE_ARRAY)
{
byte[] array = ((Values.ByteArrayValue)result.Value).Bytes.ToArray();
args.Add(array);
}
else if (result.Value.IsBoolean)
{
args.Add(result.Value.GetAsBoolean());
}
else
{
args.Add(result.Value.Data);
}
}
return(asmVal.Invoke(name, args.ToArray()));
}
else if (Util.isPremitiveType(runtimeResult.Value.Type) || runtimeResult.Value.Type == Values.ValueType.C_SHARP)
{
CallNode callNode = (CallNode)node.Node;
List <(string, Values.Value)> args = new List <(string, Values.Value)>();
for (int i = 0; i < callNode.Arguments.Count; i++)
{
RuntimeResult result = Visit(callNode.Arguments[i].Item2, context);
if (result.HasError)
{
return(result);
}
args.Add((callNode.Arguments[i].Item1, result.Value));
}
string name = ((VarAccessNode)callNode.Node).Token.Value.ToString();
return(runtimeResult.Value.CallMethod(name, args));
}
return(VisitCallNode((CallNode)node.Node, runtimeResult.Value.Context, context));
}
else if (node.Node.Type == NodeType.VAR_ACCESS)
{
if (runtimeResult.Value.Type == Values.ValueType.ASSEMBLY || runtimeResult.Value.Type == Values.ValueType.C_SHARP)
{
VarAccessNode vaccess = (VarAccessNode)node.Node;
return(runtimeResult.Value.GetAttribute(vaccess.Token.Value.ToString()));
}
}
return(Visit(node.Node, runtimeResult.Value.Context));
}
private RuntimeResult VisitBinaryNode(BinaryNode node, Context context, Context other = null)
{
RuntimeResult leftResult = Visit(node.LeftNode, context);
if (leftResult.HasError)
{
return(leftResult);
}
RuntimeResult rightResult = Visit(node.RightNode, other != null ? other : context);
if (rightResult.HasError)
{
return(rightResult);
}
if (node.OpToken.Type == TokenType.PLUS)
{
return(leftResult.Value.Add(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.MINUS)
{
return(leftResult.Value.Substract(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.MULTIPLY)
{
return(leftResult.Value.Multiply(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.DIVIDE)
{
return(leftResult.Value.Divide(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.MODULUS)
{
return(leftResult.Value.Modulus(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.EXPONENT)
{
return(leftResult.Value.Exponent(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.BITWISE_AND)
{
return(leftResult.Value.BitwiseAnd(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.BITWISE_OR)
{
return(leftResult.Value.BitwiseOr(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.BITWISE_XOR)
{
return(leftResult.Value.BitwiseXor(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.BITWISE_OR)
{
return(leftResult.Value.BitwiseOr(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.BITWISE_XOR)
{
return(leftResult.Value.BitwiseXor(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.LEFT_SHIFT)
{
return(leftResult.Value.LeftShift(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.RIGHT_SHIFT)
{
return(leftResult.Value.RightShift(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.EQUALS_EQUALS)
{
return(leftResult.Value.Equals(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.NOT_EQUALS)
{
return(leftResult.Value.NotEquals(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.GREATER_THAN)
{
return(leftResult.Value.GreaterThan(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.LESS_THAN)
{
return(leftResult.Value.LessThan(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.GREATER_TOE)
{
return(leftResult.Value.GreaterOrEqual(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.LESS_TOE)
{
return(leftResult.Value.LessOrEqual(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.BOOLEAN_AND)
{
return(leftResult.Value.BooleanAnd(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.BOOLEAN_OR)
{
return(leftResult.Value.BooleanOr(rightResult.Value));
}
else if (node.OpToken.Type == TokenType.IN)
{
return(leftResult.Value.In(rightResult.Value));
}
return(null); // todo: error handling
}
private RuntimeResult VisitCallNode(CallNode node, Context context, Context fromCtx = null)
{
List <(string, Values.Value)> args = new List <(string, Values.Value)>();
for (int i = 0; i < node.Arguments.Count; i++)
{
RuntimeResult result = Visit(node.Arguments[i].Item2, fromCtx == null ? context : fromCtx);
if (result.HasError)
{
return(result);
}
args.Add((node.Arguments[i].Item1, result.Value));
}
if (node.Node.Type == NodeType.VAR_ACCESS)
{
VarAccessNode accessNode = (VarAccessNode)node.Node;
string name = accessNode.Token.Value.ToString();
if (BuiltinMethods.BuiltinMethodList.ContainsKey(name))
{
return(BuiltinMethods.Execute(name, args, node.Position, context));
}
else
{
Values.Value method = context.GetSymbol(name);
if (method == null)
{
return(new RuntimeResult(new RuntimeError(node.Position, "Method '" + name + "' is not defined", context)));
}
if (method.Type == Values.ValueType.METHOD)
{
return(((Values.MethodValue)method).Execute(args, this));
}
else if (method.Type == Values.ValueType.CLASS)
{
Values.ClassValue classValue = ((Values.ClassValue)method).Clone();
//classValue.Type = Values.ValueType.OBJECT;
if (classValue.BaseClass != null)
{
RuntimeResult baseResult = classValue.InitializeBaseClass(context, this);
if (baseResult.HasError)
{
return(baseResult);
}
Context newContext = new Context(name, baseResult.Value.Context);
classValue.SetPositionAndContext(accessNode.Token.Position, newContext);
newContext.AddSymbol("this", classValue);
newContext.AddSymbol("base", baseResult.Value);
RuntimeResult runtimeResult = Visit(classValue.Body, newContext);
if (runtimeResult.HasError)
{
return(runtimeResult);
}
//Constructor
Values.Value ctorValue = newContext.GetSymbol("init");
if (ctorValue != null && ctorValue.Type == Values.ValueType.METHOD)
{
Values.MethodValue initMethod = (Values.MethodValue)ctorValue;
RuntimeResult res = initMethod.Execute(args, this);
if (res.HasError)
{
return(res);
}
}
return(new RuntimeResult(classValue));
}
else
{
Context newContext = new Context(name, context);
classValue.SetPositionAndContext(accessNode.Token.Position, newContext);
newContext.AddSymbol("this", classValue);
RuntimeResult runtimeResult = Visit(classValue.Body, newContext);
if (runtimeResult.HasError)
{
return(runtimeResult);
}
//Constructor
Values.Value ctorValue = newContext.GetSymbol("init");
if (ctorValue != null && ctorValue.Type == Values.ValueType.METHOD)
{
Values.MethodValue initMethod = (Values.MethodValue)ctorValue;
initMethod.Execute(args, this);
}
return(new RuntimeResult(classValue));
}
}
return(new RuntimeResult(new RuntimeError(node.Position, "'" + name + "' is not a method", context)));
}
}
return(new RuntimeResult(new RuntimeError(node.Position, "Can't call as a method", context)));
}
private RuntimeResult VisitForNode(ForNode node, Context context)
{
RuntimeResult startResult = Visit(node.Start, context);
if (startResult.HasError)
{
return(startResult);
}
if (startResult.Value.Type != Values.ValueType.INTEGER)
{
return(new RuntimeResult(new RuntimeError(node.Token.Position, "Start value must be an integer", context)));
}
int start = (int)startResult.Value.Data;
RuntimeResult endResult = Visit(node.End, context);
if (endResult.HasError)
{
return(endResult);
}
if (endResult.Value.Type != Values.ValueType.INTEGER)
{
return(new RuntimeResult(new RuntimeError(node.Token.Position, "Stop value must be an integer", context)));
}
int end = (int)endResult.Value.Data;
int step = 1;
if (node.Step != null)
{
RuntimeResult stepResult = Visit(node.Step, context);
if (stepResult.HasError)
{
return(stepResult);
}
if (endResult.Value.Type != Values.ValueType.INTEGER)
{
return(new RuntimeResult(new RuntimeError(node.Token.Position, "Step value must be an integer", context)));
}
step = (int)stepResult.Value.Data;
}
string id = node.Token.Value.ToString();
context.AddSymbol(id, startResult.Value);
Values.Value output = new Values.NullValue().SetPositionAndContext(node.Token.Position, context);
if (step > 0)
{
while (start < end)
{
RuntimeResult bodyResult = Visit(node.Body, context);
if (bodyResult.HasError)
{
return(bodyResult);
}
if (context.Return)
{
return(bodyResult);
}
output = bodyResult.Value;
if (context.Break)
{
context.Break = false;
break;
}
start += step;
startResult.Value.Data = start;
}
}
else
{
while (start > end)
{
RuntimeResult bodyResult = Visit(node.Body, context);
if (bodyResult.HasError)
{
return(bodyResult);
}
if (context.Return)
{
return(bodyResult);
}
output = bodyResult.Value;
if (context.Break)
{
context.Break = false;
break;
}
start += step;
startResult.Value.Data = start;
}
}
return(new RuntimeResult(output));
}